TOKYO -- Masayoshi Son, the charismatic leader of Japanese tech giant SoftBank Group, wakes up these days wondering which country he's in. More often than not, it's the U.S., in Silicon Valley, where he has a house.
His private jet, in which he zigzags above the globe, has flown to the U.S. West Coast over and over in the almost 100 days since May 20, when SoftBank and its partners, including Saudi Arabia, launched the $100 billion SoftBank Vision Fund.
